Here are easy instructions on how to root your S89 with a microsd card.

Prep:1)Download Tronsmart_S89_4.4.2_Root_SU-1.93.rar and extract it.

Tronsmart_S89_4.4.2_Root_SU-1.93.rar

2)Place these two files on a fat32 formatted microsd card.-factory_update_param.aml-Tronsmart_S89_4.4.2_Root_SU-1.93.zip

Root Steps:1)Turn off Tronsmart S892)Insert microsd card to S893)Using a Toothpick press and hold the hidden reset button(inside av port) and the power button until Green Android appears.4)Installation will complete and reboot automatically.

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